b : A
y : A
t14.lean:13:8: error: unknown identifier 'c'
a : foo.A
x : foo.A
t14.lean:20:8: error: unknown identifier 'c'
t14.lean:24:27: error: invalid 'using' command option, mixing explicit and implicit 'using' options
a : A
c : A
A : Type
f a c : A
foo.f foo.a foo.c : foo.A
t14.lean:47:8: error: unknown identifier 'a'
f a c : A
t14.lean:53:9: error: unexpected token